Influence of moisture on space charge dynamics in multilayer oil-paper insulation
Influence of moisture on space charge dynamics in multilayer oil-paper insulation
The main insulation system in HVDC transformer consists of oil-paper insulation. The formation of space charge in oil/paper insulation system can not only affect the dielectric strength, but also relate to the stability and security of HVDC transformer. Moisture has detrimental effect on the electrical breakdown strength and insulation life of oil-paper insulation. Thus a better understanding the influence of moisture on the charge distribution in multi-layer oil-paper insulation system becomes increasingly practical importance. In the present study, the space charge dynamics in three layers oil-paper insulation system with three different moisture concentrations (0.28, 1.32 and 4.96%) were investigated using the PEA technique under 6 kV. The influence of moisture on the charge distribution in multi-layer oil-paper insulation system was provided. Results show that the higher the moisture content of the oil-paper sample, the higher the mobility of the trapped charges, and the more obvious the positive charge injection and negative charge injection were observed. The negative charges can inject across the paper-paper interface near to the cathode when the moisture content increases to 4.96%. The higher moisture content of the oil-paper sample, the faster the dissipation rate of the charges trapped in the sample. Moreover, the higher mobility of the trapped charges leads to less slow moving charges trapped in the sample with higher moisture content
moisture, charge injection, dc voltage, oil/paper insulation, pulsed electroacoustic, space charge
1456-1464
Hao, J.
a4eae820-92ca-470f-9837-72e4bdedb0e5
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Liao, R.
4d2a673d-ab32-45ba-909b-95f2958af1bd
Yang, L.
d733a460-fd35-457e-8fdd-da512cc302e7
Tang, C.
2c13eca6-b3e5-4638-9e86-9874c839476e
August 2012
Hao, J.
a4eae820-92ca-470f-9837-72e4bdedb0e5
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Liao, R.
4d2a673d-ab32-45ba-909b-95f2958af1bd
Yang, L.
d733a460-fd35-457e-8fdd-da512cc302e7
Tang, C.
2c13eca6-b3e5-4638-9e86-9874c839476e
Hao, J., Chen, G., Liao, R., Yang, L. and Tang, C.
(2012)
Influence of moisture on space charge dynamics in multilayer oil-paper insulation.
IEEE Transactions on Dielectrics and Electrical Insulation, 19 (4), .
(doi:10.1109/TDEI.2012.6260023).
Abstract
The main insulation system in HVDC transformer consists of oil-paper insulation. The formation of space charge in oil/paper insulation system can not only affect the dielectric strength, but also relate to the stability and security of HVDC transformer. Moisture has detrimental effect on the electrical breakdown strength and insulation life of oil-paper insulation. Thus a better understanding the influence of moisture on the charge distribution in multi-layer oil-paper insulation system becomes increasingly practical importance. In the present study, the space charge dynamics in three layers oil-paper insulation system with three different moisture concentrations (0.28, 1.32 and 4.96%) were investigated using the PEA technique under 6 kV. The influence of moisture on the charge distribution in multi-layer oil-paper insulation system was provided. Results show that the higher the moisture content of the oil-paper sample, the higher the mobility of the trapped charges, and the more obvious the positive charge injection and negative charge injection were observed. The negative charges can inject across the paper-paper interface near to the cathode when the moisture content increases to 4.96%. The higher moisture content of the oil-paper sample, the faster the dissipation rate of the charges trapped in the sample. Moreover, the higher mobility of the trapped charges leads to less slow moving charges trapped in the sample with higher moisture content
Text
IEEE_TDEI_moisture.pdf
- Version of Record
Restricted to Repository staff only
Request a copy
More information
Published date: August 2012
Keywords:
moisture, charge injection, dc voltage, oil/paper insulation, pulsed electroacoustic, space charge
Organisations:
EEE
Identifiers
Local EPrints ID: 342328
URI: http://eprints.soton.ac.uk/id/eprint/342328
PURE UUID: 99d7d2d9-b1f8-46c7-b8f5-f53c8db0af57
Catalogue record
Date deposited: 22 Aug 2012 10:55
Last modified: 14 Mar 2024 11:50
Export record
Altmetrics
Contributors
Author:
J. Hao
Author:
G. Chen
Author:
R. Liao
Author:
L. Yang
Author:
C. Tang
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics